A well-stocked first-aid kit, kept within easy reach, is a necessity in every home. Injuries that require first aid are urgent, and there often isn’t time to run out to the store to grab the items necessary to treat the injury. It’s also convenient to have everything on hand that you’ll need for the next cold or flu that sweeps through your house. Treating colds and flus at the first sign of symptoms can have a powerful impact on the duration and severity of the illness.